QPH31.090A00 Siemens Pressure Switch

Overview

The Siemens QPH31.090A00 is a high-precision gas and air pressure switch designed for industrial and commercial burner applications. As a high-pressure execution model, it is engineered to break the electrical circuit when the monitored pressure increases above the manually adjusted setpoint. This switch features an automatic reset mechanism, ensuring the system can resume operation once pressure levels return to the safe range. It is built for reliability in demanding environments, offering a ventless installation and robust protection against pressure surges.

Features

• Automatic reset functionality for seamless system recovery
• Adjustable pressure range from 5 to 35 inches water column (WC)
• High-pressure execution designed to break circuits on pressure rise
• Ventless installation capability for simplified setup
• Surge protection up to 15 psi to prevent damage from sudden pressure spikes
• Durable metal base with a 1/4-inch NPT female pressure connection
• Flexible mounting options for either horizontal or vertical orientation

Specifications

• Model: QPH31.090A00
• Pressure Range: 5 to 35 in WC (12.5 to 87 mbar)
• Reset Type: Automatic
• Electrical Rating: 10A @ 125 to 250 Vac; 1/3 HP @ 125 to 250 Vac
• Maximum Operating Pressure: 6 psi (400 mbar)
• Maximum Surge Pressure: 15 psi (1 bar) for 2 seconds
• Operating Temperature: -40 F to 140 F (-40 C to 60 C)
• Connection: 1/4″ NPT female gas inlet
• Certifications: UL listed (USA and Canada), FM approved, ISO 9001 certified

Applications

• Supervision of air or gas pressures in gas trains of gas-fired equipment and burners
• Monitoring for overpressure conditions in commercial and industrial HVAC systems
• Safety shut-off control in combination with Siemens burner controls
• Use with gas families 1, 2, and 3 as well as other neutral gaseous media
• Integration into OEM burner products for high-demand industrial processes